's remember the three people who were killed, killed so brutally at the end of that bostonmarathon.krystlecampbell,martin richard and linzi lu. three people dead by a killer who had no respect for human life. the fbi is hunting. if you know where they are, if you

are just learning her identity. her nameiskrystlecampbell, agraduate of medford high school, graduated back in 2001. her employer sent out a facebook message. no words can describe how much she meant to all of us. she was an incredible woman, always full of energy and hard at work, but never too tired to share her love and a smile with everyone. krystle campbell lost her life. we're going to talk to a doctor who was on the scene, running in the race, and then turned right around to try to help those in need. i want to bring you up to date with the latest on the investigation. for that, to brooke. brooke? >> in terms of the investigation, u.s. officials are saying that there is no reporting, any connection with foreign connection, reaction from al qaeda thus far. here is what we do know. because different sources are telling cnn these bombs appear to have been placed in metal pressure cookers that were then hidden in backpacks. in terms of the saudi man we heard about, whose apartment has been searched, apparently sources telling cnn that that has no connection to the blast, but joe joh